DOVER — New Hampshire State Police and the attorney general's office have concluded their fact-finding into the murder of Greenland Police Chief Michael Maloney, a spokeswoman said Tuesday.

However, it could be weeks before more information about the fatal drug raid in which Maloney was shot dead is released to the public.

An independent panel is still probing the April 12 shooting. Details of the State Police investigation will likely be withheld until the panel's report is complete, Associate Attorney General Jane Young said Tuesday.

Investigators say 29-year-old Cullen Mutrie, a suspected drug dealer, opened fire on a team of police officers as they attempted to search his home on Post Road. Four officers were shot in rapid succession. Maloney was then killed during an ensuing gunbattle.

Mutrie was at the center of a drug investigation, and police were searching for evidence of cocaine and the prescription painkiller oxycodone when they arrived at his home, according to court documents. Police were also carrying a warrant to arrest Brittany Tibbetts, a 26-year-old Maine resident who was his alleged accomplice in drug sales.

Mutrie killed himself and shot Tibbetts dead in the midst of a lengthy standoff with police.

A probe into the incident has now lasted more than seven months. Investigators have interviewed witnesses to the shootout, tested handguns seized from the home and performed chemical analysis on suspected drugs found there. They have also scanned through computers and mobile phones owned by Mutrie and Tibbetts.

Young said she recently received reports from the State Police detailing their findings. The attorney general's office is reviewing the documents now, she said.

The findings will be used by the independent panel of law enforcement and criminal justice specialists studying the Greenland drug raid. Chaired by retired Nashua Police Chief Don Conley, the group is evaluating the decision to search Mutrie's home, as well as the manner in which the drug search was executed. It will also research how tactical issues were addressed in the planning and execution of the search, and examine the training and supervision of the officers involved.

Findings will be documented in a written report, which is set to include a recitation of the facts surrounding the shootings, a section discussing applicable Drug Task Force protocols, an assessment of the overall operation and appropriate recommendations.

A court battle is also playing out in Rockingham County regarding the assets of Mutrie's mother, Beverly Mutrie. In July, the four wounded officers sued her, claiming she “recklessly and wantonly” allowed her son to carry out a drug-dealing enterprise at the home where the shootings occurred.

The home is owned by a trust Beverly Mutrie controls, according to court records.

The plaintiffs claim Beverly Mutrie facilitated her son's criminal activities by allowing him to live in her house, drive her cars and receive her financial support.